Authors Sagidullin, A ; Skirda, W.D. ; Tatarinova, E.A. ; Muzafarov, A.M. ; Krykin, M.A. ; Ozerin, A. ; Fritzinger, B. ; Scheler, U.
Title Self-Diffusion and Nuclear Magnetic Relaxation of Dendritic Macromolecules in Solutions
Date 10.12.2003
Number 11672
Abstract The self-diffusion and nuclear magnetic relaxation of poly(butylcarbosilane) and poly(allyl-carbosilane) dendrimers dissolved in deuterated chloroform and poly(amidoamine) dendrimers with hydroxyl surface groups in solutions with methanol have been studied. The diffusion rates (D) have been measured by the pulsed-field-gradient nuclear magnetic resonance. It is shown that experimental concentration dependences D(phi) obtained for macromolecules in the dendrimer-solvent systems studied can be reduced to a unified view, and thus, the generalized concentration dependence of the normalized diffusion rates of dendrimers can be obtained. In the macromolecular volume concentration range from 0.01 up to 0.55, the generalized dependence of the normalized diffusion rates for dendrimers coincides with the analogous dependence for globular proteins in aqueous solutions; the last result suggests that self-diffusion features of dendrimers and globular proteins are in general similar. It is also shown that the experimental data obtained permit one to characterize the changes of the own monomer density of dendrimers depending on their molecular weight and, as a consequence, to make a conclusion about the swelling of dendritic macromolecules in the solutions studied.
Publisher Applied Magnetic Resonance
Citation Applied Magnetic Resonance 25 (2003) 129-156
Tags angle neutron-scattering generalized concentration-dependence poly(propylene imine) dendrimers studying translational diffusion field gradient molecular-dynamics coefficients flexibility polystyrene resonance

Back to list